关键词: 一叶萩, 大戟科, 小孢子发生, 雄配子体发育

Abstract: Microsporogenesis and the development of male gametophyte of the staminate flower in Flueggea suffruticosa(Pall.) Baill. were observed by using the method of paraffin sections. The results show that each staminate flower of F.suffruticosa has five stamens which are tetrasporangiate. There are also a few flowers with four stamens and one of the stamens has 7-8 pollen sacs. However, the development of different stamens or the pollen sacs in the same anther are not synchronous. The development of anther wall is the basic type, which is composed of epidermis, endothecium, middle layers (2 layers) and tapetum. The tapetum is of glandular type. The cytokinesis in meiosis of the microspore mother cells is simultaneous type. Most of the microspore tetrads are tetrahedral and a few of them are symmetrical. The microsporocytes are mostly normal while some are abnormal and degenerate at tetrad stage. The mature pollen grain is binuclear type and spherical in shape with three germ furrows. It also has been found that a pistillode without overy and much crystal in calyx and anther. These results could provide basic data for the research of reproductive biology and pollination biology in Euphorbiaceae.

Key words: Flueggea suffruticosa, Euphorbiaceae, microsporogenesis, male gametophyte